Bethan Ellerton is spinning balls of flaming steel wool. The sequence is running backwards so that the sparks seem to be flying at her instead of away from her. Don’t try this at home; she’s a professional. Richie Johnstonline filmed this sequence as an ad for Cascade Juggling, a juggling and circus equipment supplier. Johnstonline says,
All necessary safety precautions where taken to prevent the risk of a fire. We only shot after heavy rain (Cumbria gets alot of rain) and had a team of people standing by off camera. The steel wool we used burns out really quickly which made the risk of a fire extremely minimal.
-via Laughing Squid